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Publication Type J
Authors Messedi, D., F. Farhani, K. Ben Hamed, N. Trabelsi, R. Ksouri, H. U. R. Athar and C. Abdelly
Title HIGHLIGHTING THE MECHANISMS BY WHICH PROLINE CAN CONFER TOLERANCE TO SALT STRESS IN CAKILE MARITIMA
Source Pakistan Journal of Botany
Author Keywords Cakile martima Exogenous proline Osmoregulation Osmoprotection Induced tolerance Salt stress brassica-napus l. oxidative stress chlorophyll fluorescence sesuvium-portulacastrum antioxidant activity electron-transport osmotic adjustment glycine betaine abiotic stress growth-stages
Abstract Cakile maritima is an oleaginous halophyte growing in the sandy dunes along the Tunisian coast. In order to investigate the role of proline in inducing high salinity tolerance (200 and 400 mM NaCl) in this halophyte, we studied several aspects of the salt responses of C. maritma under exogenous proline supply (20 mM). Salinity levels above 100 mM, reduced growth, photosynthetic activity, and quantum yield of photosystem II (Phi PSII), while increasing the non photochemical quenching (NPQ). Significant inhibition of the linear electron transport rate (ETR) was also observed in plants grown at 400 mM NaCl. In addition, polyphenol content, total antioxidant and DPPH scavenging activities increased due to increasing salinity stress, and the concentration of malondialdehyde (MDA) also increased. The application of proline counteracted all these adverse effects of salt stress in plants grown at 200 mM NaCl, while it improved some of these physiological attributes at 400 mM NaCl. In addition, contribution of Na+ for the osmotic adjustment decreased in the leaves of salt treated plants supplied with proline exogenously. Exogenous application of proline induced the accumulation of potassium, proline and soluble carbohydrates in salt stressed plants, particularly at 400 mM. This explained the reason of growth enhancement induced by proline application. All together, our results showed that the beneficial effect of exogenous proline on the response of C. maritima to salinity was due to its role in the protection of chloroplast structures, antioxidant defenses and osmotic adjustment.
Author Address [Messedi, Dorsaf; Farhani, Feten; Ben Hamed, Karim; Trabelsi, Najla; Ksouri, Riadh; Abdelly, Chedly] Ctr Biotechnol Borj Cedria, Lab Plantes Extremophiles, BP 901, Hammam Lif 2050, Tunisia. [Athar, Habib-Ur-Rehman] Bahauddin Zakariya Univ, Inst Pure & Appl Biol, Multan 60800, Pakistan. Messedi, D (reprint author), Ctr Biotechnol Borj Cedria, Lab Plantes Extremophiles, BP 901, Hammam Lif 2050, Tunisia. dorsaf_messedi@yahoo.com
ISSN 0556-3321
ISBN 0556-3321
29-Character Source Abbreviation Pak. J. Bot.
Publication Date Apr
Year Published 2016
Volume 48
Issue 2
Beginning Page 417-427
Unique Article Identifier WOS:000377612400001
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